U.S. President Donald Trump shakes hand with Russian President Vladimir Putin at the end of the press conference after their meeting at the Presidential Palace in Helsinki, Finland, Monday, July 16, 2018. (AP Photo/Alexander Zemlianichenko)

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In an extraordinary embrace of a longtime U.S. enemy, President Donald Trump openly questioned his own intelligence agencies' firm finding that Russia meddled in the 2016 U.S. election to his benefit, seeming to accept Russian President Vladimir Putin's insistence that Moscow's hands were clean.